I think that the problem is rare, but many of the effected guys are seeking answers and the internet is really enabling this. Then the find this site and find that is the best resource they have found. How many are finding this site? Hard to tell.
However, the are self selecting to be here. While the numbers here appear to be alarming, the facts are different. If you go to a diabetic self help site, you will find that everyone there has diabetes or they are caring for someone who has diabetes.
If one has normal youthful amounts of testosterone, ones E2 production rates from aromatization makes the effects of 'environmental estrogens' trivial in comparison. It is natural to look for an external factor to blame, but that may be misguided.
I think that some drugs, Rx and OTC are way more of a risk than the 'environmental estrogen' risks. All pales in face of diet and lifestyle problems.
The outcome of foot ball can be the same as taking a lot of healthy young guys and lining them up and clubbing them on the heads until one or two can't walk, then doing the same the next week. The knee and ankle injuries actually take guys out off the field and reduces their chances of brain damage.
As a society we freak out about youth getting exposed to drugs and alcohol and then we take the most athletic and brightest [the ones with high academic grades], then systematically expose them to brain injury and permanent joint damage.
I think that football is a really good way to learn team work and leadership skills, and strategic thinking, but the costs are too high.